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Finding the Fourth Proportional to 787.99, 1,179.99 and 666.79

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Solution

The fourth proportional to 787.99, 1,179.99 and 666.79 is: 998.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.99 : 1,179.99 = 666.79 : x
  2. Step 2: Convert to fraction form
    787.99/1,179.99 = 666.79/x
  3. Step 3: Cross multiply
    787.99x = 1,179.99 × 666.79
  4. Step 4: Simplify right side
    787.99x = 786,805.53
  5. Step 5: Solve for x
    x = 786,805.53/787.99
  6. Step 6: Final answer
    x = 998.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.